The Weather Wire

 

November 2004                                                                                                              Volume 11 Number 11

 

Contents

 

·   Winter Weather Facts

 

·   Drought Monitor

 

·   October

    Summary

 

·   October Stats

 

·   November Preview

 

·   Sunrise/Sunset

 

·   Snow Totals

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

October 2004

 

Avg High 65.6

Avg Low 36.1

Snow - 0.0"

Season Snow - 0.0"

Precipitation - 0.86"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

November

Avg High 51.5

Avg Low 23.5

Avg Snow - 10.7"

Avg Precip - 0.98"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Skyview Weather 

2350 N Rocky View Rd

Castle Rock, CO 80108

 

Phone: (303) 688-9175

Fax: (303) 660-0548

 

E-mail:    

tim@skyview-wx.com

 

We’re on the Web!

http://www.skyview-wx.com/

 

Copyright 2004

Skyview Weather

Winter Weather Facts.. 

With our fist snowstorm of the season now in the books perhaps it is time to go over some winter weather facts and safety information.

The National Weather Service issues many different types of watches and warnings during the winter months.  Here is what they mean.

WINTER STORM WATCH:

Severe winter conditions, such as heavy snow and/or ice, are possible within the next day or two. Prepare now!

WINTER STORM WARNING:

Severe winter conditions have begun or are about to begin in your area. Stay indoors!

BLIZZARD WARNING:

Snow and strong winds will combine to produce a blinding snow (near zero visibility), deep drifts, and life-threatening wind chill. Seek refuge immediately!

WINTER WEATHER ADVISORY:

Winter weather conditions are expected to cause significant inconveniences and may be hazardous. If caution is exercised, these situations should not become life- threatening. The greatest hazard is often to motorists.

FROST/FREEZE WARNING:

Below freezing temperatures are expected and may cause significant damage to plants, crops, or fruit trees. In areas unaccustomed to freezing temperatures, people who have homes without heat need to take added precautions.

 

We as weather forecasters use different wording or terms when we describe a snow event.  Whether it is just some flurries or a large winter storm we use different words that best suit the snow event that is expected. 

Snow

FLURRIES - Light snow falling for short durations. No accumulation or light dusting is all that is expected.
SHOWERS - Snow falling at varying intensities for brief periods of time. Some accumulation is possible. You can best relate to these by thinking about a summer shower, but instead of rain you get snow.
SQUALLS - Brief, intense snow showers accompanied by strong, gusty winds. Accumulation may be significant. Snow squalls are best known in the Great Lakes region.
BLOWING SNOW - Wind-driven snow that reduces visibility and causes significant drifting. Blowing snow may be snow that is falling and/or loose snow on the ground picked up by the wind.
BLIZZARD - Winds over 35 mph with snow and blowing snow, reducing visibility to near zero.  

Sleet

Rain drops that freeze into ice pellets before reaching the ground. Sleet usually bounces when hitting a surface and does not stick to objects. However, it can accumulate like snow and cause a hazard to motorists.

Freezing Rain

Rain that falls onto a surface with a temperature below freezing. This causes it to freeze to surfaces, such as trees, cars, and roads, forming a coating or glaze of ice. Even small accumulations of ice can cause a significant hazard.

 

Snow and or severe cold can be potentially life threatening and every year we see cold and snow related deaths.

 

Everyone is potentially at risk during winter storms. The actual threat to you depends on your specific situation. Recent observations indicate the following:

  • Related to ice and snow:

    • About 70% occur in automobiles.

    • About 25% are people caught out in the storm.

  • Related to exposure to cold:

    • 50% are people over 60 years old.

    • Over 75% are males.

    • About 20% occur in the home.

FROSTBITE

Frostbite is damage to body tissue caused by that tissue being frozen. Frostbite causes a loss of feeling and a white or pale appearance in extremities, such as fingers, toes, ear lobes, or the tip of the nose. If symptoms are detected, get medical help immediately! If you must wait for help, slowly re-warm affected areas. However, if the person is also showing signs of hypothermia, warm the body core before the extremities.

HYPOTHERMIA: LOW BODY TEMPERATURE

Warning signs - uncontrollable shivering, memory loss, disorientation, incoherence, slurred speech, drowsiness, and apparent exhaustion.

Detection - Take the person's temperature. If below 95F (35C), immediately seek medical care! If medical care is not available, begin warming the person slowly. Warm the body core first. If needed, use your own body heat to help. Get the person into dry clothing, and wrap them in a warm blanket covering the head and neck. Do not give the person alcohol, drugs, coffee, or any hot beverage or food; warm broth is better. Do not warm extremities (arms and legs) first! This drives the cold blood toward the heart and can lead to heart failure.

WIND CHILL

The wind chill is based on the rate of heat loss from exposed skin caused by combined effects of wind and cold. As the wind increases, heat is carried away from the body at an accelerated rate, driving down the body temperature. Animals are also affected by wind chill.

When CAUGHT in a Winter Storm...

OUTSIDE

Find shelter:

    • try to stay dry

    • cover all exposed parts of the body.

No shelter:

    • prepare a lean-to, wind-break, or snow cave for protection from the wind.

    • build a fire for heat and to attract attention.

    • place rocks around the fire to absorb and reflect heat.

Do not eat snow: It will lower your body temperature. Melt it first.

 

IN A CAR OR TRUCK

Stay in your car or truck. Disorientation occurs quickly in wind-driven snow and cold.
Run the motor about ten minutes each hour for heat:

    • open the window a little for fresh air to avoid carbon monoxide poisoning.

    • make sure the exhaust pipe is not blocked.

Make yourself visible to rescuers:

    • turn on the dome light at night when running engine.

    • tie a colored cloth (preferably red) to your antenna or door.

    • raise the hood indicating trouble after snow stops falling.

Exercise from time to time by vigorously moving arms, legs, fingers, and toes to keep blood circulating and to keep warm.

 

AT HOME OR IN A BUILDING

Stay inside. When using ALTERNATIVE HEAT from a fireplace, wood stove, space heater, etc.:

    • use fire safeguards.

    • properly ventilate.

No heat:

    • close off unneeded rooms.

    • stuff towels or rags in cracks under doors.

    • cover windows at night.

Eat and drink. Food provides the body with energy for producing its own heat. Keep the body replenished with fluids to prevent dehydration.
Wear layers of loose-fitting, lightweight, warm clothing. Remove layers to avoid overheating, perspiration, and subsequent chill.

 

Colorado sees it share of snow during the winter months.  The best time to prepare for the next snow is now while the weather is mild and dry.  Take an inventory of you winter supplies both for the car and the home and stock in items that you need.  Be prepared and the winter snows will be a lot less bothersome this year.

 

Drought Update

In many portions of Colorado, October 2004  saw normal precipitation, or only slightly under normal.  With the moisture, the drought situation either improved or did not worsen across Colorado

The map below shows forecasted temperature deviances for the November2004 time period. As can be seen, above  normal temperatures are expected for  much of Colorado for November, though the southeaster third of Colorado is forecasted to have below normal temperatures.

The map below shows forecasted precipitation deviances for November 2004.  Normal or near normal precipitation is expected for November 2004 all of Colorado.

As can be seen in the below map, drought conditions are expected to continue to improvement across much of Colorado through January 2005.

October Summary

Although October 2004 started off with above normal precipitation and the last day of the month was also well above normal, the overall last half of the month was dominated with high pressure and dry conditions.  The precipitation that occurred Halloween, the 31st, 0.27 inch was not quite enough to get the monthly total up above the normal of 0.99 inch.  The month finished with a respectable 0.86 inch, 0.13 inch below normal.  Therefore, Denver’s above normal monthly precipitation streak ended at 4.  The total for the year now has dropped to below normal.  The annual total at the end of October stood at 14.18 inches which is only 0.02 inch below the normal.  There were 6 days with measurable moisture which is 1 above normal.  DIA measured 1.4 inches of snowfall all recorded on Halloween night.  Many areas to the south and west of DIA had as much as 3-6 inches that night.  So for the season we have 1.4 inches of snow which is 4.8 inches below normal.

Temperatures ranged from a high of 79 degrees down to a low of 24 degrees.  The monthly average was 50.0 degrees which is only 0.1 degrees below normal.  There were no temperature records set or tied for the month.  There were 9 days when the mercury dropped below the freezing mark, which is normal for October.

October Stats

TEMPERATURE (IN DEGREES F)

 

 

 

 

 

 

AVERAGE MAX

65.6

NORMAL

66.0

DEPARTURE

-0.4

AVERAGE MIN

36.1

NORMAL

35.9

DEPARTURE

0.2

MONTHLY MEAN

50.9

NORMAL

51.0

DEPARTURE

-0.1

HIGHEST

79 on the 9th

LOWEST

24 on the 31st

 

 

 

 

 

 

DAYS WITH MAX 90 OR ABOVE

0

NORMAL

0

DAYS WITH MAX 32 OR BELOW

0

NORMAL

0

DAYS WITH MIN 32 OR BELOW

9

NORMAL

9

DAYS WITH MIN ZERO OR BELOW

0

NORMAL

0

 

 

 

 

 

 

TEMPERATURE RECORDS

 

None  

 

 

 

 

 

 

HEATING DEGREE DAYS

 

 

 

 

 

 

MONTHLY TOTAL

431

NORMAL

436

DEPARTURE

-5

SEASONAL TOTAL

610

NORMAL

582

DEPARTURE

28

 

 

 

 

 

 

COOLING DEGREE DAYS

 

 

 

 

 

 

MONTHLY TOTAL

0

NORMAL

0

DEPARTURE

0

YEARLY TOTAL

495

NORMAL

696

DEPARTURE

-201

 

 

 

 

 

 

PRECIPITATION (IN INCHES)

 

 

 

 

 

 

MONTHLY TOTAL

0.86

NORMAL

0.99

DEPARTURE

-0.13

YEARLY TOTAL

14.18

NORMAL

14.20

DEPARTURE

-0.02

GREATEST IN 24 HOURS

0.27 on the 31st

DAYS WITH MEASURABLE PRECIPITATION

6

 

 

 

 

SNOWFALL (IN INCHES)

 

 

 

 

 

 

MONTHLY TOTAL

1.4

NORMAL

6.2

DEPARTURE

-4.8

SEASONAL TOTAL

1.4

NORMAL

6.2

DEPARTURE

-4.8

GREATEST IN 24 HOURS

1.4 on the 31th

GREATEST DEPTH

1 on 31st

 

 

 

 

 

 

WIND (IN MILES PER HOUR)

 

 

 

 

 

 

AVERAGE SPEED

10.2

       

PEAK WIND GUST

36mph from S on the 3rd

 

 

 

 

 

 

MISCELLANEOUS WEATHER

 

 

 

 

 

 

NUMBER OF DAYS WITH THUNDERSTORMS

9

NORMAL

4

NUMBER OF DAYS WITH HEAVY FOG

4

NORMAL

1

NUMBER OF DAYS WITH HAIL

0

 

 

PERCENT OF SUNSHINE

80

NORMAL

71

 

 

 

November Preview

Even though November is usually a tranquil month with numerous spring like days, it can also be a snow packed winter type of month.  In fact, November is Denver’s 2nd snowiest month.  March is the snowiest Denver month and April is behind November in third place.

In 1994 November was the snowiest month of that year with 16.9 inches recorded.  On the 13th and 14th of the month, 12.1 inches of snow was recorded during the 24 hour period which is was more than the total of any other month that year.  In 1991, 29.6 inches of snow was recorded making it the 2nd snowiest November.  In 1992, 20.1 inches of snow was recorded making it the 8th snowiest November.  The snowiest November occurred in 1946 with 42.6 inches of snow.

November 2002 marked the 16th month in a row for below normal precipitation for Denver.  2002 was the driest year in Denver weather history.  The below normal precipitation streak continued through February 2003, 19 months in a row.

November is tied with May as the month with the least amount of sunshine with 64%.  That compares to September that has the most sunshine with 74%.  The average November temperature is 37.5 degrees with an average high of 51.5 degrees and an average low temperature of 23.5 degrees.  Just 4 years ago, November 1999 finished as the second warmest with an average temperature of 47.1 degrees.  And just a year later, November 2000 finished as the second coldest in Denver weather history with an average temperature of 28.9 degrees.  The coldest November occurred in 1880 with an icy 22.0 degree average while the warmest November occurred in 1949 with an average temperature of 50.9.

DENVER'S NOVEMBER CLIMATOLOGICALLY NORMAL

(NORMAL PERIOD 1971-2000)

 

 

TEMPERATURE

 

 

 

AVERAGE HIGH

51.5

AVERAGE LOW

23.5

MONTHLY MEAN

37.5

DAYS WITH HIGH 90 OR ABOVE

0

DAYS WITH HIGH 32 OR BELOW

3

DAYS WITH LOW 32 OR BELOW

24

DAYS WITH LOWS ZERO OR BELOW

0

 

 

PRECIPITATION

 

 

 

MONTHLY MEAN

0.98"

DAYS WITH MEASURABLE PRECIPITATION

6

AVERAGE SNOWFALL IN INCHES

10.7"

DAYS WITH 1.0 INCH OF SNOW OR MORE

3

 

 

MISCELLANEOUS NOVEMBER AVERAGES

 

 

 

HEATING DEGREE DAYS

826

COOLING DEGREE DAYS

0

WIND SPEED (MPH)

8.2

WIND DIRECTION

SOUTH

DAYS WITH THUNDERSTORMS

0

DAYS WITH DENSE FOG

1

PERCENT OF SUNSHINE POSSIBLE

64

 

 

NOVEMBER EXTREMES

 

 

 

RECORD HIGH

79 DEGREES ON 11/14/1990

RECORD LOW

-18 DEGREES ON 11/29/1877

WARMEST

50.9 DEGREES IN 1949

COLDEST

22.0 DEGREES IN 1880

WETTEST

3.21 INCHES IN 1946

DRIEST

TR IN 1949

SNOWIEST

42.6 IN 1946

LEAST SNOWIEST

0.0 IN 1949

Sunrise/Sunset (Denver area)

     Date

Sunrise

Sunset

     November 1  

06:29

16:57

     November 5

06:33

16:53

     November 10

06:39

16:48

     November 15

06:45

16:44

     November 20

06:51

16:40

     November 25

06:56

16:38

     November 30

07:01

16:36

 Snowfall

10-31/11-1 Storm to be reported on November report.

City

 

 

 

   

Seasonal Totals

Aurora (Central)

          0.0

Castle Rock 4 NE

           0.0

Colorado Springs

           0.0
Denver DIA           0.0

Denver Downtown

          0.0

Golden

          0.0

Highlands Ranch

          0.0

Lakewood

          0.0

Littleton

          0.0

Louisville

          0.0

Parker

          0.0

Sedalia

          0.0

Thornton

          0.0

Westminster

          0.0

Wheatridge

           0.0